﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using V = Science.Mathematics.VectorCalculus;

namespace VectorCalculus5Ed.Chapter2.Section3
{
    public class Example08
    {
        public Example08()
		{
		}
		private string result;
		public string Result
		{
			get{return result;}
		}
        public void Compute()
        {
            V.Function.ToLastType<double[], double> f
                = new V.Function.ToLastType<double[], double>(func);
            double[] x = { 3.0, 2.0};

            V.Gradient obj = new V.Gradient(f, x);
            obj.Compute();

            result += obj.Result[0].ToString() + "    ";
            result += obj.Result[1].ToString() + "\r\n";

            result += (x[1] * Math.Exp(x[0] * x[1]) + x[1] * Math.Cos(x[0] * x[1])).ToString() + "    ";
            result += (x[0] * Math.Exp(x[0] * x[1]) + x[0] * Math.Cos(x[0] * x[1])).ToString() + "\r\n";
        }
        private double func(double[] x)
        {
            return Math.Exp(x[0] * x[1]) + Math.Sin(x[0] * x[1]);
        }
    }
}
/* 
808.777927558136    1213.16689133832
808.777927558771    1213.16689133816
*/

